Ignore what I say in the video. I don't think that the fields of the 4 magnets are attracting. I'm forcing 4 magnets together with similar poles up. The corners do appear to be in the centre of the magnets the closer they are to the ferrocell. this config is basically acting as one magnet.

you will see a thin darkish line appear when I role the magnets back and forth. this is the separation zone between the north and south poles on a magnet or between to separate magnets or in this case between to joined magnets.